Screw cap with a guarantee strip

a screw cap and guarantee strip technology, applied in the field of screw caps, can solve the problems of large rear engagement in the region of the break-off web, difficult production of screw caps, and often destruction of relatively fragile locations

Inactive Publication Date: 2004-03-25
TERXO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The manufacture of such screw caps is problematic.
Although the rear-engagements in the region of the thread are not a problem, the rear-engagements in the region of the break-off webs represent a large problem.
These relatively fragile locations are often destroyed on manufacture.
This leads to interruption of production and to the rejection of the manufactured closures.
The result of this is a difficult opening of the screw cap.
This however leads to extraordinarily expensive tools.
The manufacture however is enormously expensive, alone on account of the two-step manufacture.
Furthermore, the assembly is a further problem of this embodiment.
These closures are not regarded as particularly secure.
On screwing-on, the edges of the ratchet-like parts are slightly deformed, and thus such closures may often be also unscrewed without damage to the guarantee strip.

Method used

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  • Screw cap with a guarantee strip
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  • Screw cap with a guarantee strip

Examples

Experimental program
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Embodiment Construction

[0022] The screw cap 1 may basically be formed conventionally. The screw cap 1 comprises a circumferentially cylindrical casing wall 7 which is closed off to the top by a cover surface 50. On the lower side of the cover surface 50 there can be an annular sealing bead 51. The casing wall 7 has an inner thread which is preferably formed as a fine thread 17. The fine thread 17 only needs to be provided in the lower region of the casing wall 7. A guarantee strip 5 is integrally formed on the lower edge of the casing wall 7 via break-off webs 6. The guarantee strip 5 may be designed conically widening to the bottom as in the embodiments according to the FIGS. 1, 2 and 4-6. Such a design is aesthetically satisfactory and also has the advantage of an easy removal from the mold. In contrast to guarantee strips which are arranged aligned directly below the casing wall of the screw cap, with a guarantee strip of the shape shown, no rear-engagement is present. Accordingly, the core of the inje...

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Abstract

Screw caps with guarantee strips are known. Usually, such guarantee strips are torn off by means of a tab or the guarantee strip encompasses an edge on the container and all of the predetermined breaking point links are torn in their longitudinal direction when the cap is unscrewed. According to the invention, radially projecting parts are provided on the container or its pouring opening (2) in the form of positive closing means (11, 12) which engage in corresponding recesses (13, 15) of the guarantee strip on the screw cap and prevent mutual twisting. Twisting on the screw cap results in a shearing movement being exerted on the predetermined breaking links (6), which have little resistance against these forces.

Description

[0001] 1. Field of the Invention[0002] This invention relates to a screw cap of plastic and to a container of plastic or soft material with a pour-out, wherein the screw cap has a guarantee strip at the lower circumferential edge, which via break-off webs is connected to the lower edge of the casing wall of the screw cap.[0003] 2. Discussion of Related Art[0004] Screw caps of the above mentioned type have been known for many years, and their design shape is not least dependent on the material from which the container on which the closure is placed is manufactured. With glass bottles the pour-out is usually standardized and the rotary closures must accordingly correspond to the standard. With containers of plastic one may vary the pour-out much more freely. With containers of so-called soft material, pour-outs of plastic are fastened thereon, which may be manufactured with a large degree of freedom with regard to design. This invention relates to screw caps which cooperate with conta...

Claims

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Application Information

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Patent Type & AuthorityApplications(United States)
IPC IPC(8): B65D41/34B67B3/22
CPCB65D41/3409B67B3/22B65D41/3447
InventorDUBACH, WERNER FRITZ
OwnerTERXO